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首页> 外文期刊>RSC Advances >A water-stable luminescent metal–organic framework for effective detection of aflatoxin B1 in walnut and almond beverages
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A water-stable luminescent metal–organic framework for effective detection of aflatoxin B1 in walnut and almond beverages

机译：水稳定的发光金属有机框架，用于有效检测核桃和杏仁饮料的黄曲霉毒素B1

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Sensitive and rapid detection of aflatoxin B1 (AFB1) without using antibody or biomolecular modifications in water is achieved using a novel water-stable luminescent metal–organic framework (LMOF) termed Zr-CAU-24. The 1,2,4,5-tetrakis(4-carboxyphenyl) benzene (H _(4) TCPB)-based LMOF with high water-stability has demonstrated drastic fluorescence fading in the presence of AFB1. The detection limit for AFB1 using this porous nanomaterial reaches as low as 19.97 ppb (64 nM), which is below the applicable action level for peanut and corn products set by the FDA and among the most sensitive sensors reported for AFB1. We further investigated its response to five other mycotoxins including AFB2, AFG1, AFG2, AFM and OTA and their Stern–Volmer quenching efficiencies are significantly below that of AFB1 (138?461 M ~(?1) ). The prepared water-stable LMOF was directly used for the detection of AFB1 in spiked walnut and almond beverages. High recovery rates (91–108%) were achieved in 5 min. We found that the quenching of H _(4) TCPB molecules towards mycotoxins was remarkably enhanced by anchoring them into the periodic framework and its mechanism was discussed. The presented method with acceptable detection limit is of potential for the development of low-cost, robust and sensitive sensors for the rapid detection of AFB1 in agricultural and food products.
机译：使用新的水稳定发光金属 - 有机骨架（LMOF）达到ZR-Cau-24，实现了在不使用水中的抗体或生物分子修饰的敏感和快速检测水溶液的敏感和快速检测。基于具有高水稳定性的基于LMOF的1,2,4,5-四羧基（4-羧基苯基）苯（H _（4）TCPB）在AFB1的存在下表现出激烈的荧光衰落。使用该多孔纳米材料的AFB1的检测限为低至19.97ppb（64nm），低于FDA设定的花生和玉米产品的适用作用水平，并且是AFB1报道的最敏感的传感器。我们进一步调查了对包含AFB2，AFG1，AFG2，AFM和OTA等其他五种霉菌毒素的反应，并且它们的船尾淬火效率明显低于AFB1（138？461M〜（？1））。制备的水稳定LMOF直接用于检测尖刺核桃和杏仁饮料中的AFB1。在5分钟内实现了高回收率（91-108％）。我们发现，通过将它们锚固到周期性框架中，显着提高了H _（4）TCPB分子对霉菌毒素的猝灭，并讨论了其机制。具有可接受的检测极限的呈现方法是开发低成本，鲁棒和敏感传感器，用于在农业和食品中快速检测AFB1。

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